Everytime you have incoming message to your Mail, you will realize that there is a sound echoed by your Mail. This sound is set as New Mail Sound by your Mail default. The fun thing here is you can set this incoming Mail sound with custom sound.
Do you want to this setting custom Mail sound can be done?
Would you mind decreasing your volume a bit please..?
Yeah, of course. Most of the people will just use the volume key on their laptop (F4 or worst, F3). It results in your one block of sound bar disappear.